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06-15-2010 Council Work Session Packet
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06-15-2010 Council Work Session Packet
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ENERGY CONSERVATION OPPORTUNITY <br /> Summary of Recommendations <br /> Table 4 gives the estimated annual demand, energy, and natural gas consumption savings for the three <br /> system configuration options. The annual estimated cost savings associated with the demand, energy, and <br /> natural gas savings compared to the high efficiency furnaces are shown. The carbon savings as well as the <br /> capital cost, and simple payback for each option are also shown in Table 4. <br /> The City Hall, Council Chambers and Police Department are located next to the City of Orono's water <br /> treatment facility. This allows for the opportunity to use water to air heat pumps in these buildings that are <br /> tied to the city water main through a double wall heat exchanger. The use of the city water main will <br /> increase the efficiency of the heat pumps due to the typical 50°F temperature of the city water supply. The <br /> geothermal HVAC with the heat exchanger (HX) has the greatest energy savings as well as the greatest <br /> reduction in carbon dioxide production. <br /> For detailed descriptions and analyses, please refer to the Conservation Opportunity Analysis section. <br /> Ta,ble 4. Summary of Recommendations <br /> E , � # • � � � � e � � � ». • � . 4 � � <br /> � a ' � i, <br /> s € a ��' <br /> �- '. <br /> � ,s��,. <br /> .�.;s` ,�_; - <br /> High Efficiency Furnace System 47,690 1,743 22% - $90,950 - <br /> Geothermal HVAC w/Well Field 48,460 4,890 30% $2,786 $222,600 47.3 <br /> Geothermal HVAC w/HX 53,130 4,890 32% $3,285 $190,460 30.3 <br /> Conservation Opportunity Analysis <br /> Demolition <br /> Demolition work for this project will consist of the removal of the fifteen natural gas furnaces and their <br /> corresponding condensing units. The existing thermostats would be removed. The refrigerant lines and <br /> combustion air and exhaust ductwork would be removed and the penetrations sealed. <br /> New Construction and Operation <br /> The proposed system will utilize water-to-air heat pumps that will either extract or reject heat to the city <br /> water main as needed to heat or cool the building. There will be a double walled brazed plate heat <br /> exchanger to ensure that there is no mixing of the heat pump water with the city water. Piping would need <br /> to be buried between the buildings and the location of the connection to the city main. <br /> The new heat pumps would be controlled by new programmable thermostats and serve the same zone as <br /> the furnace being replaced. These thermostats will be able to be locked out to prevent unauthorized users <br /> from adjusting the settings. <br /> 005.10.01 Page 10 of 18 City of Orono <br /> May 28,2010 Geothermal HVAC Feasibility Study <br /> engineers � consultants � commissioning <br /> MEP Associates,LLC� 7607 Equitable Drive,Eden Prairie,MN 55344�phone:952.224.4488 fax:952.224.4489�www.mepassociates.com <br />
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